version bump for 6.8.3 (#46354)

Author: Paul Sanwald

buildSrc/version.properties

@@ -1,4 +1,4 @@
-elasticsearch     = 6.8.3
+elasticsearch     = 6.8.4
 lucene            = 7.7.0
 
 # optional dependencies

server/src/main/java/org/elasticsearch/Version.java

@@ -147,8 +147,9 @@ public class Version implements Comparable<Version>, ToXContentFragment {
     public static final Version V_6_8_1 = new Version(6080199, org.apache.lucene.util.Version.LUCENE_7_7_0);
     public static final Version V_6_8_2 = new Version(6080299, org.apache.lucene.util.Version.LUCENE_7_7_0);
     public static final Version V_6_8_3 = new Version(6080399, org.apache.lucene.util.Version.LUCENE_7_7_0);
+    public static final Version V_6_8_4 = new Version(6080499, org.apache.lucene.util.Version.LUCENE_7_7_0);
 
-    public static final Version CURRENT = V_6_8_3;
+    public static final Version CURRENT = V_6_8_4;
 
 
     private static final ImmutableOpenIntMap<Version> idToVersion;